Ryan,

There are some demos included with the SDK that should get you started.  However these demos do not recognize an area of the image.  Take a look at the Recognize methd in the OcrEngine object.  It lets you pass in a rectangular bounds to indicate the area you wish to OCR.  It returns an OcrPage element. If you iterate through each of the OcrRegions, and look for an OcrTextRegion, you'll find the text that was recognized.

I created a ZonalOcrDemo in C# attached to this post that should help you get started using zonal OCR.